Fix regional s3 endpoint suffix for cn region
Fix regional s3 endpoint suffix for cn region

aws/amazon-ecs-init,aws/amazon-ecs-init,kiranmeduri/amazon-ecs-agent,aws/amazon-ecs-agent,kiranmeduri/amazon-ecs-agent,kiranmeduri/amazon-ecs-agent,kiranmeduri/amazon-ecs-agent,aws/amazon-ecs-init,aws/amazon-ecs-agent,aws/amazon-ecs-agent,aws/amazon-ecs-agent